UUCP Public Directory

The directory /var/spool/uucppublic is the
one place in every system to which UUCP by default is able to copy files.
Every user has permission to change to /var/spool/uucppublic and
read and write files in the directory. However, the directory's sticky bit
is set, so the directory's mode is 01777. As a result, users cannot remove
files that have been copied to it and that belong to uucp.
Only you, as UUCP administrator logged in as root or uucp, can remove files from this directory. To prevent the uncontrolled
accumulation of files in this directory, you should ensure that you remove
files from it periodically.

If this maintenance is inconvenient for users, encourage them
to use uuto and uupick rather than removing
the sticky bit, which is set for security reasons. See the uuto(1C) man page for instructions
for using uuto and uupick. You can also
restrict the mode of the directory to only one group of people. If you do
not want to risk someone filling your disk, you can even deny UUCP access
to it.